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authorRiccardo Mancini <rickyman7@gmail.com>2021-08-09 23:11:02 +0300
committerArnaldo Carvalho de Melo <acme@redhat.com>2021-08-10 17:32:37 +0300
commit4241eabf59d5b7e9b5b567526f6e319f81dff894 (patch)
treefcf5d2ee9a848a4450505aaa4059d270f1abc31d /tools/perf/builtin-bench.c
parentf2c24ebadd90b4165ce2c49c3c6a100312266f54 (diff)
downloadlinux-4241eabf59d5b7e9b5b567526f6e319f81dff894.tar.xz
perf bench: Add benchmark for evlist open/close operations
This new benchmark finds the total time that is taken to open, mmap, enable, disable, munmap, close an evlist (time taken for new, create_maps, config, delete is not counted in). The evlist can be configured as in perf-record using the -a,-C,-e,-u,--per-thread,-t,-p options. The events can be duplicated in the evlist to quickly test performance with many events using the -n options. Furthermore, also the number of iterations used to calculate the statistics is customizable. Examples: - Open one dummy event system-wide: $ sudo ./perf bench internals evlist-open-close Number of cpus: 4 Number of threads: 1 Number of events: 1 (4 fds) Number of iterations: 100 Average open-close took: 613.870 usec (+- 32.852 usec) - Open the group '{cs,cycles}' on CPU 0 $ sudo ./perf bench internals evlist-open-close -e '{cs,cycles}' -C 0 Number of cpus: 1 Number of threads: 1 Number of events: 2 (2 fds) Number of iterations: 100 Average open-close took: 8503.220 usec (+- 252.652 usec) - Open 10 'cycles' events for user 0, calculate average over 100 runs $ sudo ./perf bench internals evlist-open-close -e cycles -n 10 -u 0 -i 100 Number of cpus: 4 Number of threads: 328 Number of events: 10 (13120 fds) Number of iterations: 100 Average open-close took: 180043.140 usec (+- 2295.889 usec) Committer notes: Replaced a deprecated bzero() call with designated initialized zeroing. Added some missing evlist allocation checks, one noted by Riccardo on the mailing list. Minor cosmetic changes (sent in private). Signed-off-by: Riccardo Mancini <rickyman7@gmail.com> Tested-by: Arnaldo Carvalho de Melo <acme@redhat.com> Cc: Ian Rogers <irogers@google.com> Cc: Jiri Olsa <jolsa@redhat.com> Cc: Mark Rutland <mark.rutland@arm.com> Cc: Namhyung Kim <namhyung@kernel.org> Cc: Peter Zijlstra <peterz@infradead.org> Link: http://lore.kernel.org/lkml/20210809201101.277594-1-rickyman7@gmail.com Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
Diffstat (limited to 'tools/perf/builtin-bench.c')
-rw-r--r--tools/perf/builtin-bench.c1
1 files changed, 1 insertions, 0 deletions
diff --git a/tools/perf/builtin-bench.c b/tools/perf/builtin-bench.c
index 62a7b7420a44..d0895162c2ba 100644
--- a/tools/perf/builtin-bench.c
+++ b/tools/perf/builtin-bench.c
@@ -88,6 +88,7 @@ static struct bench internals_benchmarks[] = {
{ "synthesize", "Benchmark perf event synthesis", bench_synthesize },
{ "kallsyms-parse", "Benchmark kallsyms parsing", bench_kallsyms_parse },
{ "inject-build-id", "Benchmark build-id injection", bench_inject_build_id },
+ { "evlist-open-close", "Benchmark evlist open and close", bench_evlist_open_close },
{ NULL, NULL, NULL }
};